Lid for a cup



FIG. 1 is a front view of a lid for a cup showing my new design in a first state;

FIG. 2 is a rear view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof in a second state. 

CLAIM The ornamental design for a lid for a cup, as shown and described. 